Abstract: A numerical investigation on the performance of abackward-forward double-detonation driver for high enthalpy shock tubes wasconducted by solving one-dimensional Euler equations with the DispersionControlled Dissipative (DCD) scheme. The modified two-step chemical reactionmodel was applied to describe chemical reactions of the oxygen-hydrogenmixture. The numerical results indicate that if the initial pressure ratioof the auxiliary driver section to the primary driver section is less thanthe critical value as was estimated under the condition of no Taylorexpansion waves in the driver, Taylor expansion wave is still observablewith a smaller angle of the expansion wave fan; if the initial pressure ratiois set to be equal to the critical value, Taylor expansion waves disappearand the incident shock wave does not attenuate in the driven section; if theinitial pressure ratio is taken to be larger than the critical value, notonly Taylor expansion waves disappear, but also an over-driven detonationwave develops in the detonation driver and can increase further the drivingpressure.